87469821 has 16 divisors (see below), whose sum is σ = 129729600. Its totient is φ = 58248144.

The previous prime is 87469751. The next prime is 87469843. The reversal of 87469821 is 12896478.

It is not a de Polignac number, because 87469821 - 2¹³ = 87461629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87469861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43210 + ... + 45188.

It is an arithmetic number, because the mean of its divisors is an integer number (8108100).

Almost surely, 2^87469821 is an apocalyptic number.

It is an amenable number.

87469821 is a deficient number, since it is larger than the sum of its proper divisors (42259779).

87469821 is a wasteful number, since it uses less digits than its factorization.

87469821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625 (or 3619 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 87469821 is about 9352.5301924132. The cubic root of 87469821 is about 443.9009548977.

The spelling of 87469821 in words is "eighty-seven million, four hundred sixty-nine thousand, eight hundred twenty-one".